— Do you know where Mary is? I couldn’t find her anywhere. — Well . She        have gone far—her coat’s still here.

— What do you want to eat for lunch? I will prepare it earlier today. — You_____, mum. Let’s go out to have something different. 

—Must I return the book to you now, Jack? —No, you _____. You can give me back tomorrow.

Since nobody gave him any help，he ________ have done the research on his own.

 —Boy, you _______ lean (伸) out of the window while the bus is running. That’s dangerous.—Sorry, I won’t do that again.